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  1. By: Érard, Christian - Etchécopar, Robert Daniel
    Type: Article
    In: Mémoires du Muséum national d'histoire naturelle
    Volume: 66
    Issue: 1
    Date: 1970
    Page Range: 1--146
    Publication Info: Paris, Éd. du Muséum, 1950-1992
  2. By: Érard, Christian - Etchécopar, Robert Daniel
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 90
    Date: 1970
    Page Range: 158--161
    Publication Info: London, British Ornithologists' Club, 1893-